{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T15:54:54.820Z","years_from_j2000":26.675,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"dp-leo-b","name":"DP Leo b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":997.0078616596501,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":169.3162193,"dec_deg":17.9615717,"epoch_ra_deg":169.669853,"epoch_dec_deg":17.814981,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"DP Leo","semi_major_axis_km":1225206561.0329998,"periapsis_km":null,"mass_kg":1.1919780092404118e+28,"mass_msun":0.00599463,"constellation":"Leo","discovered":"2009","featured":false,"url":"https://spacecatalog.org/object/dp-leo-b","radius_km":81001.87,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"DP Leo","host_v_mag":18.6837,"eccentricity":0.39,"uncertainties":{"mass_kg":[1.1008713820393451e+27,1.1008713820393451e+27],"distance_ly":[90.03220650492985,109.4385109790761],"eccentricity":[0.13,0.13],"host_temperature_k":[500,500],"semi_major_axis_km":[58343169.573,58343169.573],"orbital_period_days":[730,730],"argument_of_periastron_deg":[20,20]},"host_mass_solar":0.69,"stars_in_system":2,"discovery_method":"Eclipse Timing Variations","host_radius_solar":0.0115,"planets_in_system":1,"discovery_facility":"Yunnan Astronomical Observatory","host_temperature_k":13500,"orbital_period_days":10220,"periastron_epoch_bjd":2453025,"equilibrium_temperature_k":24.39,"argument_of_periastron_deg":-78},"designations":[{"catalog":"Exoplanet","designation":"DP Leo b"},{"catalog":"Host star","designation":"DP Leo"}],"source":{"id":"exoplanet_archive","name":"NASA Exoplanet Archive (Planetary Systems Composite Parameters)","url":"https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars","license":"Public domain (NASA)"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}